Initial commit: adacam-api v1.0.0

Clean Python Flask replacement for odc-api (434k lines Node.js → ~350 lines Python)
- GET /api/1/landmarks/last/{N} - last N detections from SQLite
- POST /api/1/landmarks - ingest detections + forward to AdaMaps
- GET /api/1/gnssConcise/latestValid - GPS fix from Redis
- GET /api/1/status - device status
- GET /api/1/deviceinfo - device identity
- GET /api/1/recording/frames/latest - latest frame path

No /api/1/cmd - that's the CVE, it's gone.

Includes:
- SQLite for local storage + offline queue
- Background thread for AdaMaps retry
- systemd service unit
- install.sh for device deployment

adacam_api/redis_client.py

@@ -0,0 +1,40 @@
+"""Redis client for GPS and IMU data."""
+import json
+import redis
+
+_client = None
+
+
+def get_client():
+    """Get Redis connection."""
+    global _client
+    if _client is None:
+        _client = redis.Redis(host="localhost", port=6379, decode_responses=True)
+    return _client
+
+
+def get_latest_gnss():
+    """Get latest GPS fix from GNSSFusion30Hz ZSET."""
+    client = get_client()
+    try:
+        # Get the most recent entry (highest score = most recent timestamp)
+        results = client.zrevrange("GNSSFusion30Hz", 0, 0, withscores=True)
+        if results:
+            data = json.loads(results[0][0])
+            return {
+                "lat_deg": data.get("lat_deg"),
+                "lon_deg": data.get("lon_deg"),
+                "alt_m": data.get("alt_m"),
+                "unix_milliseconds": int(data.get("unix_milliseconds", 0)),
+                "hdop": data.get("hdop"),
+                "num_satellites": data.get("num_satellites", 0),
+            }
+    except (redis.RedisError, json.JSONDecodeError):
+        pass
+    return None
+
+
+def has_gps_lock():
+    """Check if we have a valid GPS lock."""
+    gnss = get_latest_gnss()
+    return gnss is not None and gnss.get("num_satellites", 0) >= 4